package com.cj.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.cj.reggie.common.BaseContext;
import com.cj.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    // 路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        log.info("拦截到请求:{}",((HttpServletRequest) request).getRequestURI());
//        chain.doFilter(httpServletRequest,httpServletResponse);
        // 1.获取本次请求的URI
        String requestURI = ((HttpServletRequest) request).getRequestURI();
        // 定义不需要处理的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        // 2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        // 3.如果不需要处理，则直接放行
        if (check) {
            log.info("请求{}不需要处理",requestURI);
            chain.doFilter(request, response);
            return;
        }

        // 4-1.判读登录状态，如果已经登录，则直接放行
        if (httpServletRequest.getSession().getAttribute("employee")!=null) {
            Long employeeId = (Long) httpServletRequest.getSession().getAttribute("employee");
            log.info("用户登录，id={}",employeeId);
            BaseContext.setCurrentId(employeeId);
            chain.doFilter(request,response);
            return;
        }
        // 4-2.判读登录状态，如果已经登录，则直接放行
        if (httpServletRequest.getSession().getAttribute("user")!=null) {
            Long userId = (Long) httpServletRequest.getSession().getAttribute("user");
            log.info("用户登录，id={}",userId);
            BaseContext.setCurrentId(userId);
            chain.doFilter(request,response);
            return;
        }
        // 5.如果未登录则返回未登录,通过输出流方式像客户端页面响应数据
        log.info("未登录");
        httpServletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    /**
     * 路径匹配，检测本次请求是否需要放行
     *
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
